Steam-generator



(N0 Model.)

W. A. PENTBCOST. STEAM GENERATOR.

y,Patented Oct. 13, 1885.

Fly 2 WITNESS/5S.'

UNrTEn STATES PATENT OFFICE.

VILLIAM A. PENTECOST, OF "WORCESTER, MASSACHUSETTS, ASSIGNOR TO THE PENTECOST STEAM GENERATING COMPANY, OF SAME PLACE AND NASIIUA, NEV HAMPSHIRE.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 328,140, dated October 13, 1885.

Application filed August 7, 1F85. Serial No. 173,855. (No model.)

To all whom it may concern.-

Be it known that I, VILLIAM A. PENTE- oosT, a citizen of the United States, residing at Worcester, in the county of Vorcester and State of Massachusetts, have invented certain new and useful Improvements in Steam-Generators; and I declare the following to be a description of my said invention suciently full, clear, and exact to enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

rIhis invention relates to improvements in the steam-generator for which Letters Patent No. 315,160 were granted to me April 7, 1885; and it consists in the peculiar construe` tion and arrangement of the parts of the boiler or generator, whereby the crown-sheet and dome are extended beyond the diameter of the furnace, and supported on laterally-extending flanges at the top of the furnace-walls, with downwardly-directed flues employed for conducting the gases to the space beneath said Bauges, in the manner shown and described.

Figure l shows a vertical section of my improved generator, and Fig. 2 shows a horizontal sectional view at line .r w, one half of said sectional view being taken above the top of the furnace, just below the crown-sheet, the other half being taken through the top of the furnace and the downward fines.

In reference to parts, A denotes the base. B indicates the furnace-section or lower part of the boiler, containing the fire-chamber C, which chamber is surrounded by the double wall b b', between which is the annular waterspace B. The top of the inner wall, b, eX- tends outward horizontally in a broad flange, d, having at its outer edge an upward-standing rim, e, to which the crown sheet or plate D is secured by bolts,or in other suitable manner, as shown. The outer wall, b, is made of less height than the inner wall, b, and this outer wall is also provided with a broad hori- Zontal flange or ledge, f, which supports the dome 0r top of the generator G. Said fiange f is located at some distance below the flange d, and passages or iiues c extend through the space from the upper to the lower flange, connect-ing them in the manner indicated, and leaving space between said ilues for the free passage of water Vfrom the upper part of the generator to the annular space which surrounds the furnace. The flange f has upon its underside an annular vertical rim, f', or a series of lugs, located outside the openings of the flues c, to which is secured the petticoat-sheet H, that depends from said flange to near the bottom of the generator, in the manner illustrated.

The walls b b and flanges d and f, together with the iiues c, are cast integral or in asingle piece.

The rim e and outer portion of the ledge f can be conveniently dressed or turned off in a lathe to formthe seats or joint-surfaces for the' crown-sheet B and dome G.

The dome G, or top part of the generator, may be of cast-iron, and is preferably of hemispherical form, with a rim-iiange, g, about its lower edge, which is bolted to the ledge or fiangef. To the side of said dome may be attached the regulatingchamber J, containing the iioat and inlet valve apparatus for controlling the water-supply, which devices, being substantially the same as described in my former patent, need not be herein more fully explained.

The grate I may be arranged across the bottom of the furnacegin any suitable manner.

The door P, for feeding the furnace, is located at the front of the apparatus, as indi cated.

K indicates a truss or brace for supporting the crown-sheet by means of bolts k, which connect said crown-sheet with the truss or bar in the manner illustrated.

L indicates the external casing, M the sm okeue, and N the steam-pipe.

The hot gases from the ire within the furnace C rise upward against the center of the crowirsheet, then ilow onward in radial di rection, and down through the fines c and space h, between the petticoat-sheet and outer wall, b', thence upward in the space m, between the casing L and generator, to pass out through the chimney-flue M.

Among the advantages of this construction IOO may be mentioned the enlargement of the crown-sheet, and consequent increased heating-surfaces in eXcess of the size of the furnace; also, the facility and convenience of manufacture, as the parts can be conveniently cast and fitted, thus producing a very efiicient generator at comparatively small expense.

Vhat I claim as of my invention, and desire to secure by Letters Patent, is-

l. The lower or furnace section of the generator, formed, as described, with outer and inner walls, b b', said inner Wall having a horizontal iange, d, with rim e, and said outer wall having a horizontal lange,f, at lower level, with passages or ilues C, leading through said anges, and connecting the space above and below the same, in the manner set forth.

2. The combination of the lower part'of the generator, formed with outer and inner walls, b b', surrounding the, furnace and inclosing the annular water-space B', and provided, respectively, with the horizontal {ianges d and f, the downwardly-extending iiues c, passing through said flanges, the eX- tended crown-sheet D, secured to the rim e, iange d, and the dome G, secured to the flange f, substantially as and for the purpose set forth.

3.. The combination of the lower or furnace section, formed with upper and lower outwardly-extending langes,d and f, disposed as shown, with passages or ilues c, extending through the same, the crown-sheet plate secured to au annular borderrim, e, on said upper ilange, d, the dome G, secured to the ange f, the petticoat-sheet secured to and depending from an annular rib or lugs on the lower side of langef, outside the flue-openings, the base A, and the inclosing-casing L,

substantially as and for the purpose set forth. 4o

Vitness my hand this 6th day of July, A. D. 1885.

WILLIAM A. PENTEGOST. Vitnesses:

GHAs. H. BURLEIGH, HARRY H. SIBLEY. 

